Link chain



FIG. 1 is an elevational view of a link chain showing our new design;

FIG. 2 is an edge view thereof;

FIG. 3 is an enlarged perspective view of one of the links per se;

FIG. 4 is an elevational view of the link per se;

FIG. 5 is an edge view thereof; and

FIG. 6 is an end view thereof. 

The ornamental design for a link chain, substantially as shown and described. 